Frequency Reconfiguring of Microstrip Antenna for Wideband and Multiband Applications

Abstract

The goal of this thesis is to design and analyze the frequency reconfigurable microstrip patch antennas which are mainly the combination of and#956;C-and#956;EMS Switch with Series and Shunt Capacitor Switch. The increasing demand for high data rate and new wireless communication has led to the development of multifunctional devices including antennas and radio frequency (RF) front ends. The novel solution is to design antennas which have multiband, multimode, low profile, low cost and easy to integrate with portable devices. newlineThe radio frequencymicro-electro mechanical system (RF MEMS SP4T) switch is combined with the U- and I-shaped slots of the radiating patch to allow the antenna s reconfigurability. Two U- and I-shaped slots are inserted into the circular radiating patch to switch off the WiMAX IEEE 802.16 (3.30 3.80 GHz) and WLAN IEEE 802.11a/h/j/n (5.15 5.35 GHz, 5.25 5.35 GHz,5.47 5.725 GHz, 5.725 5.825 GHz) frequencies, respectively. The design involves a microstrip patch antenna where and#956;EMS switches are placed to alter the effective length of the antenna, thereby changing its resonant frequency. newlineThe and#956;C controls the switching states of the and#956;EMS, facilitating dynamic frequency adjustments. The proposed antenna can switch between several frequency bands with minimal impact on its radiation characteristics. newlineThe integration of and#956;EMS with the microstrip layout is successfully achieved, addressing challenges related to switch reliability newlinevi newlineand performance degradation. newlineA microstrip patch antenna that can operate across multiple frequency bands using RF MEMS shunt capacitor switches for reconfiguration. The goal is to create an antenna suitable for multiband applications. RF MEMS shunt capacitor switches are incorporated into the microstrip patch antenna at specific locations to adjust the effective capacitance and shift the resonant frequency. newlineThe proposed work utilizes the substrate material as FR4-epoxy which has the dielectric constant value of 4.4 and the thickness of the substrate is taken as 1.6 mm.